Tall and slender even by elven standards, Eirwen has warm brown skin, long dark auburn hair usually braided close to the scalp, and gray-green eyes flecked with gold. A faint scar crosses her left eyebrow, and her hands are callused from drill, sword maintenance, and years of copying sacred texts. She wears polished chain mail beneath a deep blue tabard embroidered with a simple silver sunburst.

Quietly attentive and unfailingly prepared, Eirwen notices small changes in people's voices, clothing, and routines. She is courteous with strangers, protective of the vulnerable, and more comfortable discussing ancient doctrine than making casual conversation. Her dry humor appears unexpectedly, usually after a long silence.

Eirwen Aderyn was raised in a quiet elven shrine built among ancient beech trees, where the acolytes tended memorial lanterns for the dead and taught travelers the old songs of safe passage. She was never the most devout singer or the most graceful celebrant. Her mind wandered toward the practical questions beneath every prayer, such as who kept the roads safe, who guarded the shrine during winter, and why the temple archives contained so many accounts of villages abandoned without aid. Her tutors eventually discovered that she had a gift for languages, history, and patient observation, and they placed her in charge of both the records and the night watch. When raiders burned a nearby wayhouse, Eirwen left the shrine with a borrowed sword and a mandate from her elders to learn what had made the roads unsafe. She trained with the temple guards, finding that the discipline of arms gave shape to the compassion she had always felt. She now travels as a warrior-acolyte, offering protection before preaching and gathering evidence before passing judgment. She still carries a copy of the shrine's oldest funeral litany, convinced that every life lost on the road deserves to be remembered by name.